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30 Cards in this Set

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Where are carbohydrates located?
Outside the membrane
Carbohydrates serve as
recogniton sites for other cells and molecules
Carbohydrates bond
Covalently bonded to lipids or protiens
Glycolipids
Carbohydrates covalently bonded as lipid
Glycoprotiens 1
a carbohydrate covalently bound to a protien
glycoproteins 2
usually oligosaccharides chains no more than 15 lengths
glycoproteins 3
recognizable to other cells and proteins
basis of cell-to-cell adhesion
oligosaccaride of one cell can bind to a mirror image on adjacent cell
Processes that allow cells to arrange in groups
cell recogniton
cell adhesion
Cell recogntion
one cell specifically binds to another cell of a certain type
Cell adhesion
relationship between two cells is "cemented"
Cell recognition and adhesion depend on
membrane proteins
Membrane glycoprotein is responsible for
cell recogniton and adhesion in sponges
Binding of cells is either
homotypic or heterotypic
Homotypic `
the same molecules stick out of both cells and the exposed surfaces bind to each other
Cell adhesion protiens
can initiate the formation of specalized cell junctions
Tight Junctions
specailized structures at the plasma membrane that link adjacent epithilial cells
Tight Junctions 2
result from mutual binding of strans of specific membrane proteins, which form a series of joints, encircling in each epithilial cell
Tight Junctions Two Functions
-prevent substances from moving through the spaces between cells
-restrict the migration of membrane proteins and phospholipids from one region to another
Tight Junctions Help
ensure the directional movement of materials into the body
Desmosomes
-specailized structures associated w/ plasma membrane
-hold adjacent cells firmly together acting like spot welds or rivits
Plaque
-dense structure on the cytoplasmic surface of the plasma membrane
-is attatched to special cell adhesion proteins in plasma membrane
Plaque is attatched to
intermidate fibers in the cytoplasam
Plaque is made up of
Keratin
Keratin Function
-structure from one cell to other
-anchored on bottom
-provide mechanical stability to epithilal tissue
Gap Junction
are a means of communication
Tight Junctions and desmosomes
have mechanical role
Gap Junctions 2
Faciliate comunication between cells
Gap Junctions are made up of
specialized protein channels, called connexons
Connexons
span the plasma membrane of two cells and intracellular space between